Improvement in stills for oil



JOHN GRACIE, OF PITTSBURG, PENNSYLVANIA.

`IMPROVEMENT IN STILLS FOR OIL.

Specification forming part of Letters Patent No. 117,405, dated July 25, 1871.

To all whom #may concern:

`declare that the following is a full, clear, and eX- act description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon.

The nature of my invention consists in a still provided With return-fines communicating` with lire-chambers and smoke-flue 'or iues, the Whole being so constructed that the oil in the still Will be evaporated Without exposing' the bottom to a direct action of a distilling or decomposing` heat.

To enable others skilled in the art to make and use my invention7 I will proceed to describe its construction and operation.

In the accompanying drawing, which forms a part of my specification, A represents the masonry of the furnaces and the base upon Which the still A rests. The still A is provided With iiues B, which are arranged in itin a horizontal position, and communicate with the flules I), which lead to the fire-chambers C, arranged around the still at suitable intervals. The ilues B comunif nieate with iues e, Which pass up the sides and over the top of the casing h, and connect with the chimney or smoke-Stack f. The case h, Which surrolnids the still, is used for the purpose of protecting' the still from the action of the atmosphere, and the space o, which is between the case h and the still, is used for the purpose of cooling oil' the still prior to filling or charging it With oil, or for the purpose of cleaning' it. The casing It should be furnished With openings at its lower edge and These openings should at points near its top. be closed during the operation cf distill'mg. The still should be furnished With two or more openings near its bottom for the purpose of cleaning it, and for admitting cold air into the still after the process of distilling has been completed. The form and size and arrangement of these openings I leave to the judgment of the mechanic and distiller. rlhe still is provided With pipes, condenser, and all the usual appendages of stills for oil, and is charged with oil in the usual manner. The oil, in the evaporating or distilling process, should never fall below the top ofthe ilues B. Each of the smokeilues e may be continued up as indicated by the dotted lines X. The heat and smoke pass from the furnaces U through lues D into ilues B, and

from them up through flues e into the chimney or smOke-ilue f.

The construction of the still and the several parts connected therewith will be readily understood from the foregoing' description and by reference to the accompanying drawing; and the operation of the same will be understood Without further description.

I wish it clearly understood that I .am aware that evaporating-vessels and stills have been constructed With horizontal ilues 5 but in every such case their bottoms have been exposed to the direct action ofthe fire. i

Having thus described my improvement, what I claim as of my invention is- The still A provided with a'series of horizontal return-lines, B, com1nunicating with iire-chanibers and a Smoke-due or iiues, substantially as herein described, and for the purpose set forth.

JOHN GRAOIE.

Witnesses:

GEO. H. THOMAS, JAMES J. JOHNSTON.

FFIOE., 

